The National Transportation Library - Provides online access to documents and databases covering all aspects of transportation in the US. Material comes from public and private organizations and access is free. -- http://ntl.bts.gov/

U.S. Department of Transportation - Oversees federal highway, air, railroad, and maritime and other transportation administration functions; components include the FAA, FHA, FRA, NHTSA, OIG, and STB. Site links to related agencies and organizations, safety resources, and current news. -- http://www.dot.gov/